[#6]Pass gfx structs by const ref (gfx::Vector2d)

cc/scheduler/texture_uploader.cc

Index: cc/scheduler/texture_uploader.cc
diff --git a/cc/scheduler/texture_uploader.cc b/cc/scheduler/texture_uploader.cc
index e194ede6b74edfac19373e59a06bb043e2372ef1..784f762410422aeaa8c582960dc1678f645cb693 100644
--- a/cc/scheduler/texture_uploader.cc
+++ b/cc/scheduler/texture_uploader.cc
@@ -131,7 +131,7 @@ void TextureUploader::EndQuery() {
 void TextureUploader::Upload(const uint8* image,
                              const gfx::Rect& image_rect,
                              const gfx::Rect& source_rect,
-                             gfx::Vector2d dest_offset,
+                             const gfx::Vector2d& dest_offset,
                              ResourceFormat format,
                              gfx::Size size) {
   CHECK(image_rect.Contains(source_rect));
@@ -175,7 +175,7 @@ void TextureUploader::ReleaseCachedQueries() {
 void TextureUploader::UploadWithTexSubImage(const uint8* image,
                                             const gfx::Rect& image_rect,
                                             const gfx::Rect& source_rect,
-                                            gfx::Vector2d dest_offset,
+                                            const gfx::Vector2d& dest_offset,
                                             ResourceFormat format) {
   TRACE_EVENT0("cc", "TextureUploader::UploadWithTexSubImage");
 
@@ -229,7 +229,7 @@ void TextureUploader::UploadWithTexSubImage(const uint8* image,
 void TextureUploader::UploadWithMapTexSubImage(const uint8* image,
                                                const gfx::Rect& image_rect,
                                                const gfx::Rect& source_rect,
-                                               gfx::Vector2d dest_offset,
+                                               const gfx::Vector2d& dest_offset,
                                                ResourceFormat format) {
   TRACE_EVENT0("cc", "TextureUploader::UploadWithMapTexSubImage");